arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0807.3427cs.GT
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两人调度机制的一个特征

A characterization of 2-player mechanisms for scheduling

George Christodoulou, Elias Koutsoupias, Angelina Vidali

摘要:

研究了不相关机器调度的机制设计问题,刻画了两个参与者的决策真实机制在定义域同时包含正值和负值时的特征.我们发现,类的真实机制是非常有限的:一个决定性的真实机制划分成组的任务,使每个组中的任务分配独立于其他组。在一个组的大小至少为2的任务分配的仿射极小和任务在单例组的任务独立的机制。这个特征是关于所有真实机制的,包括那些具有无界逼近比的机制。这种方法的一个直接结果是,即使对于两个任务,两个参与者的机制的近似比也是2。事实上,对于两个参与者,VCG是唯一的最佳近似2的算法。这个特征提供了一些支持,任何决定性的真实机制(对于3个或更多个玩家)将任务划分为组,其中一些由仿射极小化器分配,而其余的由阈值机制分配(其中任务在低于阈值时分配给玩家,该阈值仅取决于其他玩家的值)。我们还表明,在这里的阈值机制类是相同的添加剂机制类。

英文摘要:

We study the mechanism design problem of scheduling unrelated machines and we completely characterize the decisive truthful mechanisms for two players when the domain contains both positive and negative values. We show that the class of truthful mechanisms is very limited: A decisive truthful mechanism partitions the tasks into groups so that the tasks in each group are allocated independently of the other groups. Tasks in a group of size at least two are allocated by an affine minimizer and tasks in singleton groups by a task-independent mechanism. This characterization is about all truthful mechanisms, including those with unbounded approximation ratio. A direct consequence of this approach is that the approximation ratio of mechanisms for two players is 2, even for two tasks. In fact, it follows that for two players, VCG is the unique algorithm with optimal approximation 2. This characterization provides some support that any decisive truthful mechanism (for 3 or more players) partitions the tasks into groups some of which are allocated by affine minimizers, while the rest are allocated by a threshold mechanism (in which a task is allocated to a player when it is below a threshold value which depends only on the values of the other players). We also show here that the class of threshold mechanisms is identical to the class of additive mechanisms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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